Hi António: Please take a look at my most recent push. The highlights are I have committed the changed version of aurora.png that you donated, done a substantial code cleanup, moved to linking with the plplotcxx library rather than the plplot library, fixed some build issues, and figured out how to enable *and* use plscolbg(a) properly for the memqt device without compromising functionality. Please try this method (using a transparent Qt5 image initialization or transparent PLplot background as needed) also for your own private examples to confirm my claim of no compromise of functionality for this method is true. I am pretty sure you will like what I have done, but if you feel there is any problem with my changes, I will try and figure it out to your satisfaction.
Assuming you like what I have done, that leaves only one remaining memqt_example issue as far as I am concerned. That issue is the proper display of the actions which are supposed to contain semi-transparent results. Currently, they are plotted as semi-transparent on a white background imposed by Qt5, but that is not the correct result as we have recently discovered by looking at pqiv results. @everybody: for the others here I have recently discovered a method of displaying semi-transparent PLplot plots correctly which is to use the --transparent-background option of pqiv (that option name is a misnomer which should have been called something like --honor-alpha since all it does is honor the alpha channel information contained in the image that is being displayed). To see what this option can do, try the following to build the relevant pngqt device and C example 11, create a semi-transparent version of that example, and display that result properly: make qt make x11c examples/c/x11c -dev pngqt -o test.png -bg FFF_0.4 -fam pqiv -i --transparent-background test.png.8 This works well on my Debian Buster KDE compositing desktop where the composited result is 40 per cent PLplot result and 60 per cent whatever is below that plot on the desktop. However, this nice result is not what is delivered by Qt5 because its default action is to insert an opaque white layer as an additional background for the semi-transparent memqt_example actions. @António: I am not sure whether you have tried the above pqiv example yet on your own (openSUSE) KDE compositing desktop, but I think it should "just work" for you as well as it did for me. Which leaves the development topic of how to convince Qt5 to do similar correct rendering of the semi-transparent actions of memqt_example? Google is no help (because of an enormous number of irrelevant hits for the search terms "qt5 semi-transparent" (without the quotes) which discuss creating semi-transparent results [which we already have done with memqt_example] but those hits typically do not discuss rendering those results properly with Qt5). So can you use your Qt5 expertise to help me figure out how to do this? Alan __________________________ Alan W. Irwin Research affiliation with the Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada. Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
